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Have I blown my 300


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Hey guys need help, went for a quick fang this arvo and was full noise 5th on a sweeping bend. It was really ringing its neck then all of a sudden nothing. Tiried to kick it felt locked up tried electric start and wouldnt wind. Afterabout 5 minutes it would wind and kick but absolutely no life felt like it had compression??? Its a 2014 exc 300 with only 28 hours and well looked after. Im devastated could I haveover reved it and blown it? Should this happen? I thought this was the most bullet proof machine ever. I cant stress enough how meticulous I am with this bike. Should I be pulling the head and cylinder off to start?

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Cheers guys. Ill start pulling it down in tbe next few days. It was tuned at 40:1 buy the bike shop and I havent touched it.

i have over 50 hrs on my 13" xcw300 running 60:1 motorx with spec jets. I think your problem falls on your tuner. This is my piston with 50 hours on it. Like new.

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